Another operator programmed a show and ran it. At the end of the show he dropped the Grandmaster to 0 and then shutdown. Later I started up and programmed another show, ran through all the cues, saved the show and shutdown. The next day I started up, loaded my show and started to run it. During all these actions the GM was at 0. Part way through, I decided I needed to use the Grandmaster to temporarily fade a scene to black and then come back up. At this point I noticed that the Grandmaster was at the zero setting (at no time was the LED in the Blackout button lit). As soon as I started to raise the Grandmaster the stage went black and the LED in the Blackout button came on. I raised the GM to full and normal operation resumed.
Is this a bug or a "feature"?